Evaluation of the Stress Intensity Factor in a Structure Repaired with an Elliptical Composite Patch

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The process of repairing structures by composite materials having various advantages. This method has received much attention from researchers and engineers. In this study, the finite element method is used to analyze the behaviour of a central crack repaired by bonded boron/epoxy composite patch by computing the stress intensity factor at the crack tip. The effects of mechanical and geometrical properties on the behaviour of the structure are highlighted. The results show that the stress intensity factor at the crack tip repaired by an elliptical patch is reduced to 5 % with regard to the repaired by a circular patch.
The reduction obtained by using a boron/epoxy of fibers perpendicular to the crack is more important compared to the same patch having its fibers parallel to the repaired crack. The adhesive properties must be optimised to increase the performance of the patch repair or reinforcement
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Elliptical Patch; Bonded Repair; Cracks Patching; Stress Concentration Factor (CSF); Stress Intensity Factor (SIF); Finite Element Analysis

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